[Public-List] Propellers

[Meinhold, Michael J.]

I kind of feel like a three blade prop is just one more blade to scrape,
and another blade to drag through the water when sailing. If the Atomic
4 is healthy you would have to have some pretty strong currents to make
no headway with the originally designed prop.

Do the Sea Scouts always book it down the ICW at more than 7+ knots? 

I do our annual Fall Cruise in the company of some pretty big boats, and
I just get to spend more time on the bay than they do. I usually leave
anchorages earlier and arrive later but have more fun (at least I think
so!)


Mike 
Rinn Duin #272 (A4 and 2 blades)


-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Bart Knapp
Sent: Monday, November 14, 2011 2:14 PM
To: Alberg 30 Public List
Subject: [Public-List] Propellers

In the refit of our A30, it occurred to me that now would be as good a
time
as any to upgrade the propeller.  This past summer I was on an Allmand
31
with a two bladed prop and in company with an Erickson 35 and Shannon
39.
We were on the ICW from Galveston to Corpus and initially had the wind
directly on the bow.  The Allmand had quite a task keeping up with the
other
two.  I know that just by size of the boat, there would be a problem,
but
with both the Erickson and Shannon throttling back, the Allmand had all
it
could do to keep within about two miles of the others - that was under
full
sail (after the wind had shifted) and the motor running.  The owner of
the
Erickson said that by changing from a two bladed to three bladed prop,
the
Allmand would have picked another knot or so.  The Allmand was pushing
to
get 5 knots over ground with motor only and was just tipping 7 - 7.5
motor
sailing with a favorable wind direction and about a 30-35 degree heel.

 

Even though the A30 is currently land locked on a lake and effectively
dry
docked because of the drought, if we get it to Galveston Bay, we will
then
be able to get out to the Gulf of Mexico and the ICW.  I am looking
toward
sailing on the bay and take an occasional trip on the ICW.  Those trips
may
be in the company of other boats including the Erickson and Shannon, but
some others that are close to the same size as the A30 and going on up
in
size.  Most of these cruises would be on conjunction with Sea Scout
cruises
as was this summer's.  I came away from the cruise this summer with the
feeling that the Alberg would not be a good boat for the type of use we
put
boats to on the summer cruise, but it is a case of a bird in the hand -
an
A35 would be better, but..

 

Anyway, if I do change the prop out, what would be the size and pitch I
would need to be looking for.  Currently it would be married up to an
A4.  

 

Any thoughts or ideas would be helpful.

 

Bart Knapp

 

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